Đáp án:

1. Some exercises are done by Mary everyday.

2. A good cake is made by my aunt.

3.the roof of my school are repaired by the workers.

4. English is being taught by the new teacher.

5. Accidents are often caused by sleepy drivers.

6. Football are liked by English people.

7. Alice's grandparents are visited by Alice every week.

8. Old photographs are kept in these boxes by my grandfather.

9. The chickens are fed every morning by Bill.

10. Tim hasn't been seen since he left school in 1990.

11. The fishing village was destroyed by a violent storm.

12. The decision was made by the lawyer.

Phân tích:

→ Present simple:

Dùng cấu trúc S + be + VP3 (+ by + O)

→ Past simple:

Dùng cấu trúc S + was/were + VP3 (+ by + O)

→ Present perfect:

Dùng cấu trúc S + have/has + been + VP3 (+ by + O)

→ Past perfect:

Dùng cấu trúc S + had + been + VP3 (+ by + O)